Sheldon: Professor Hawking?
Professor Hawking: Oh, brother. You should see the look on your faces.
Leonard: You really didn't like our paper?
Professor Hawking: I like your paper very much. The premise is intriguing.
Sheldon: Then why are you attacking us?
Professor Hawking: If you were sitting in a chair for forty-years, you'd get bored, too. Anyway, gotta go, I promised to help the neighbor kid with his math homework. Ciao.